The trackpad on your MacBook Pro &lpar;Retina, Mid 2012&rpar; may become unresponsive after applying the MacBook Pro &lpar;Retina&rpar; Trackpad Update. This can occur when the update is interrupted by the computer going to sleep.

If you have access to an external mouse or other pointing device, connect it and reapply the update. Do not disconnect the power or allow the computer to sleep during the update process.

Follow these steps if you do not have access to an external mouse or other pointing device: